High-volumetric-capacity WSe_2 Anode for Potassium-ion Batteries |
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| Institution: | College of Chemistry and Materials Science,Fujian Normal University,Fuzhou 350007,China;CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China;Innovation Academy for Green Manufacture,Chinese Academy of Sciences,Beijing 100190,Chin;CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China;University of Chinese Academy of Sciences,Beijing 100039,China |
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| Abstract: | Exploring high-capacity electrode materials is critical for the development of K-ion batteries. In this work, we report a layered-structured tungsten selenide(WSe2) anode, which not only delivers an ultrahigh volumetric capacity of 1772.8 Ah/L(or 188.4 mA h/g) at a current density of 5 mA/g but also exhibits good rate capability(72 mA h/g at 200 mA/g) and cycling stability(83.14% capacity retention over 100 cycles at 100 mA/g). We have also revealed the underlying reaction mechanism through ex situ X-ray powder diffraction. Furthermore, proof-of-concept full-cell batteries comprising of WSe_2 anodes and Prussian Blue cathodes are capable of delivering an energy density of 135.2 Wh/kgcathode+anode. This work highlights the potential of WSe_2 as a promising high-volumetric-capacity anode material for rechargeable potassium-ion batteries. |
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